Fifty years ago, going to space was everyone’s goal. In the intervening years, we’ve sent ships and stations and satellites to the stars, but soon we may not be able to visit space much anymore. This video explains the Kessler Syndrome. In a nutshell, the Kessler Syndrome describes the cost of sending so much stuff to space: pollution. Soon, we may not be able to go to space because there is too much pollution in the way.